Step 1

Sift flour and a pinch of salt into a large bowl. Add butter in small pieces. Working quickly, combine the dough into coarse crumbs. Add cold water and form into a ball. Wrap in plastic wrap, transfer to refrigerator, and let rest for approx. 30 - 60 min.

Step 2

In the meantime, cut mozzarella into small cubes and grate Gruyère and Parmesan cheeses. Mix cheeses with sour cream and salt. Season to taste with pepper, smoked paprika and nutmeg. Set aside until needed.

Step 3

Preheat oven to 180°C/350°F. Peel long thin strips from zucchini, eggplant and carrots. Try to make all the same width if possible, halving some lengthwise if needed. Season each slice with salt and pepper.

Step 4

Flour work surface. Remove dough from refrigerator and roll out thinly. Grease tart pan and place dough into it. Trim edges if needed. Using a fork, poke holes into bottom, return to refrigerator, and let rest for approx. 10 min.